Buffer



Patented Oct. 23, 1934 -UNITEDSTATES PATENT oFF-ICE Gabriel N. Dcarie, Montreal, Quebec, Canada Application August 26, 1933, serial No. 686,905

In ,Canada September 2, 1932 Claims. (Cl.- 16-86) The present invention relates to improvements inbufers or cushioning devices. l

An important object of the invention is the provision of a relatively simple bufferadaptable 5 for cushioningdoors and for many other purposes.

A further object of the invention is the provision of a buffer constructed so that the bufiing action is `absorbed bythe combined effect of the resilient material forming the buffer and as well as pneumatic action.

Another object of the invention is the provision of a buffer of the above character which may be easily and quickly installed and which may be firmly retained in buing position.

Still another` object of the invention is the provision of a buffer of the above type having an air chamber formed so that air will be trapped and compressed therein during the buiing action.

A still further object of the invention is the provision of a buffer of the above character which may be manufactured and sold at a relatively low cost.

Other objects and advantages of the invention will become apparent as the description progresses.

In the accompanying drawing forming a part of this specication and in which like reference characters are employed to designate correspond ing parts throughout the same:

Figure 1 is a side elevational view of the pre ferred form of buffer,

Figure 2 is a longitudinal section taken on the line 2-2 of Figure 1,

Figure 3 is a horizontal section taken on the line 3-3 of Figure 1,

Figure 4 is a perspective view showing the manner of mounting the buffer in a door framev Figure 5 is a section through a door and door frame showing the buffer operatively associated therewith,

Figure 6 is a side elevational view of a modified form of buffer,

Figure 7 is an end View of the same,

Figure 8 is a longitudinal section taken on the line 8--8 of Figure 7,

Figure 9 is a section through a door and door frame showing the modified form of buffer operatively associated therewith, and

Figure 10 is a fragmentary enlarged section showing the buffer head in compressed arrangement.

Referring particularly to Figures 1 to 5 inclusive, wherein is shown a preferred embodiment of the invention, the numeral 20 designates the shank of the buffer constituting a tapered conical shaped member terminating at a relatively sharp'point at one end. At the opposed enlarged endV of the shank 20 is formed a tapered neck 21 having a decreasing taper from the largest diaineteror base of the conical member toits juncture'with a head 22.

The head 22, which is generally of flat annular form, is of greater diameter than the largest diameter of the conical shank, as shown to advantage at Figures l and`2. In the margin of the inner face of the head 22 is formed an annular groove or depression 23.

The shank 20, neck 21 and head 22 are preferably of integral construction and formed of resilient or elastic material, as for instance rubber. This form of the device is particularly applicable to doors set in metallic frames, the buffer being installed by initially forming a circular opening 24 in the stop portion of the frame, indicated at 25, and inserting the buffer into the opening 24 point foremost. The opening 24 is preferably of a diameter less than the greatest diameter of the shank 20 so that the base portion of the shank is tightly forced through the opening and the material defining the opening disposed snugly about the neck 21, as shown at Figure 5. When thus disposed, the tapering contour of the neck 21 will cause the inner side of the head 22 to be snugly pressed against the frame stop.,

The modified form of the buffmg device, disclosed at Figures 6 to 10 inclusive, embodies an elongated cylindricalshank 2'7 having formed integral with or connected to one end an enlarged preferably elongated buffer head 28. At the inner side, the head 28 is formed with a pair of cavities or depressions 29 arranged between the base of the shank and the end portion of the head and having an approximately semicircular outline.

This form of buffer is especially designed for use in connection with doors hung in wooden frames, an elongated hole 30 being bored into the door stop of the frame to slidably accommodat-e the shank 27 therein, the inner side of the head being pressed rmly against the edge of the stop, as shown to advantage at Figure 9. The buffer is secured against accidental displacement by means of a nail 31 or other suitable fastening element.

In both forms of the device the bufling action, caused by a door or other similar means, causes compression of the buffer head, the impact being absorbed by the resilient substance of which the buffer is formed and by the restricted dis- 110 charge of air compressed in the depressions or chambers formed in the inner side of the head Which cause pneumatic cushioning action. The pneumatic cushioning action effected by the restricted discharge of air from the chambers in the inner side of the head, after this air has rst been compressed by the compression of the head, produces a more eiective cushioning action and prolongs the life of the device.

It is to be understood that the forms of my invention herein shown and described are to be taken as preferred examples of the same, and that various changes as to the shape, size and arrangement of parts may be resorted to Without departing from the spirit ofthe invention or the scope of the subjoined claims.

Having thus described my invention, I claimz 1. An article of manufacture comprising a shank, and an enlarged buffer head at one end of the shank, the said head being provided with an annular air chamber in the inner side thereof and spaced concentrically to the shank so as to form a shoulder preventing escape of air around the shank.

2. An article of manufacture comprising an elongated retaining member, and a at buffer head formed at one end of the retaining member having an annular recess in the inner side disposed in a plane transverse to the retaining member axis so that air may be compressed therein during compression of the buier head,

said recess being concentric to and spaced around the retaining member so as to form an abutting shoulder.

3. A buffer comprising a conical shank, a flat buifer head, and a reduced neck connecting the shank with the central portion of the buffer head, the said head being provided at the inner side with a depression spaced concentrically to the shank so as to form a shoulder.

4. A buffer comprising a conical shank formed of resilient material, a tapering neck formed at the inner end of the shank, and a head formed at the reduced end of the neck and of a diameter greater than the diameter of the shank, the inner side of the head being provided at its middle portion with an annular groove concentric to the shank.

5. A buffer comprising a shank adapted to be associated with a at surface, a resilient buffer head formed integral with the shank and extending transversely thereof, and air compressing means formed on the inner side of the head and adapted to dampen the impact of a movable body brought against the outer side of the head, this body compressing the head and forcing the same against the flat surface, whereby air trapped in the compressing means is compressed therein and arrests the body movement before being forced out.

GABRIEL N. DE'CARIE. 

